<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    #p1{color: red}
    .c1{color:blue;}
    h3,#p1,.c1{background-color: yellow}
    input[type='text']{background-color: red}
    input[type='password']{color: green}
    *{
      border: 1px solid red;
    }
  </style>
</head>
<body>
<input type="text">
<input type="password">
<h3>我是h3</h3>
<p id="p1">苹果</p><p class="c1">香蕉</p><p>橘子</p>
<div>冰箱</div>
<div class="c1">洗衣机</div>
<div>电视</div>
</body>
</html>